Adaptec by PMC's Series 7 controllers look to redefine the capabilities of the modern RAID controller. With a focus on a high native port count and new SAS HD cabling, the Series 7 controllers deliver an amazing 6.44 GB/s of sequential speed in tandem with 450,000 random IOPS.

4K Random Read

We deployed the SanDisk Lightning LS 300S EFD's to saturate the controller with 4K random read speed. We ran into a limitation again with the random write speed testing, with none of our solutions coming close to handling the incredible write speed of the ASR-72405.

The Lightning's were configured into a RAID 0 with 64K stripe size, and then we created four clients to maximize results. We topped out at 557,000 IOPS, and experienced an average of 534,763 IOPS during the test period.

The random read latency from the ASR-72405 is superb, with the majority of read requests, 43% (488,834,830 I/Os), fell into the 0.00-0.02 range. 15% fell in the 1-2ms range, 12% at .6-.8ms, 11% at .4-.6 and 10% at .8-1ms.

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